Automobile brake



Nov. 25, 1930. R. J. en's AUTOMOBILE BRAKE Filed July 13, 1929 3Sheets-She et 2 Nov. 25, 1930. Grrs 1,782,891

AUTOMOBILE BRAKE Filed Jul 13, 1929 s Sheets-Sheet s &nm 18 llll ing myimproved brake.

Patented not. 25, 1930.

v A REM: J. GITS, or cnrceeo, rumors AUTOMOBILE BRAKC;

. Applicatiop filed July 13:,

This invention relates to that class of aur tomobile brakes which aredesigned to automatically become effective when the vehicle starts toroll backward on a down-grade, and. :5 has a connection to the ear shiftlever,

whereby the brakeui'ieans is rendered inoperative as desired, andparticularly when the gearshift lever is placed in position for engagingthe reverse gear. N

The purposes of the invention are to provide animproved sy 1 etrical andsimple bralfe means of this 0 ass and in which the braking force isapplied uniformly at a plurality of different points around t e driven.

15 member to which'the brake is applied, so

as to prevent any tendency toward radial displacement of such drivenmemberwith an accompanying bending strain on its, shaft.

The objects of'the invention are accom plished by a construction asshown in the drawingg in which: s

-Figure 1 is a fra entary vertical section of a vehicle transmisslonmechanisfii'embody- Fig. 2 is an enlarged fragmentary vertical sectiontaken on the line of Fig. 1, showing the brake parts ina released posi-.tion. r Q

Fig. '3 is a section similar to Fig. 2 showing the braking mechanism inits operating position for preventing backing. e s

Fig.4 is a. section similar to Fig. 2 show ing the braking mechanism inposition with -3' forward rotation ofthe shaft. 1

Fig. 5 is a fiagmentary vertical section taken on the line 5-5 of Fig.2.

Fig'. 6 is a fragmentary horizontal section taken on the line 6-6 ofFig. 2. Fig. 7 is a fragmentary, vertical section takenon the line 7-;7of Fig. 2. g Fig. 8 is a fragmentary section similar to Fig? showing theparts in a changed position. I The herein described braking device uti;lizes the principle common in roller clutches, wherein 8r plurality ofrollers located at 1 equal distances apart around a driven shaft orother rqtatingdevice are aused to grip the same upon one direction ofrotatiomof the shaft, due to the rollers wedgingbetween 1925. serial No.378,141.

0 c v I the driven member and inclined isurfaces of'.

a fixed associated member. The braking'de vice is arranged to coactwith'a collar to the propeller shaft of the vehicle and is preferablysupported on the rear end of the transmission gear housing. Itconsistsof a hardened ring surrounding apropeller shaft and bolted to thegearhouing, the inner sur face of the ring being cut out to provide aplurality of inclined surfaces between which and a collar fixed to thepropeller shaft are the gripping rollers. Mounted for angular adjustmentat the faces of the stationary clutch ring is a pair of gripping rollercontrol members, which carry pins for engaging the gripping rollers sothat the latter may be, retained in its inoperative position orpermitted to grip or be positively disengaged.

In the specific construction illustrated in the.drawing s, the numeral 1indicates the hardened fixed ring surrounding the propeller shaft 2, andwhich is'bolted at 3 to the 2' transmission gear housing 4. Thetransmission*housing is provided with bosses at the location of thebolts 3 in order. to space the ring 1 the required distance from thehous-' ing to allow for oneof the pair of-memberS 5 constituting part ofthe gripping roller adjustment means. The other? member 5 is of the sameconstruction and is located at'the opposite face of ring 1*.

The members 5 are rigidly secured together i by rivets 6, onwhichare journale'd sleeves 7, passing through the openings 8 cut through thering'l and adjacent the hardehed collar 2 fixed to the propeller shaft2.. The openings 8 are inclined as indicated by the line 10 so that thegripping (rollers 11 may w'edg ingly engage betweenthe surfaces 10 ofring' 1 and the outer annular surface of collar 9."

spring"1 0.1 attached at one end to the ad usting members 5 and at itsother end to the fixed ring 1 yieldably retains the adjust; ing membersin the position shown-in Fig. 3 so as to hold the gripping rollers 11 inengagement with the inclined surface 10 of the ring 1 and the peripheryof the collar 9.

The adjusting members 5 are provided with outwardly extending parts 12;to which one end of a toggle 13 is pivotally secured by a bolt 14. Thetoggle is located below and exsuflicient length to accommodate the lever17 tends transversely of a shift rod 15 which when the rod is in bothforward speed and carries an arm 16 for moving the reverse neutralpositions but when the rod 15 is gear of the transmission into and outof an moved to a reverse speed pos1t1on the moperating position and theother end of the clined extremity of the slot rocks the lever toggle ispivotally secured to the gear hous- 17 and straightens the toggle 13.This action ing 4. The parts 5 have annular surfaces 5.1 has the sameeffect as the manual adjustment which ride on and are carried by spacedpins of the set screw 18. 5.2. Although but one specific embodiment ofPivotally mounted on" the gear housing this invention is herein shownand described, 4 is a lever 17 having a channel in which a it will beunderstood that various details of joint 18.1 of the toggle is seatedand which the construction shown may be altered or normally rests freelyupon the toggle 13 peromitted without departing from the spirlt of. mitting it to assume the buckled position this invention as defined joy thefollowmg shown in Fig. 3. Stop pin 18.2 limits the cl im 1 throw ofjoint 18. I claim: A. manually operable set screw 18 is pro- 1. In anautomobile braking device of the C vided for bearing upon the lever 17so as to class described, a propeller shaft provided straightenthetoggle 13, rotate the adjustwith an annular braking surface,afixed brak-20 ing members 5 to the position shown in Fig. ing ring surrounding saidbraking surface 2 and render the braking mechanism inopand havinginclined surfaces facing said brakerative. Formed in the shift rod 15 isa ing surface, gripping 'O located betwell .groove 19 which registerswith the lever 17 said braking ring and said braking surface,

when the rod 15 is in its forward speed and control means forpositioning said rollers beneutral positions as shown in Figs. 3 and 7,tween the braking surface and braking ring and which permits the toggleto assum an into wedging relationtherewith for one direcangularposition. The groove 19 has an intionof rotation of the shaft, and meansfor clined extremity 20 for engaging the lever 17 m n lly adjusting saidcontrol means to when the shift rod is moved to its r v r hold therollers in inoperative position. position for rocking the lever tostraighten I n ile braking device f h the toggle. This action rendersthe brake class described, the combination with gear mechanisminoperative when the reverse gear t a o mechanism comprising a drivis ina driving position. ing shaft, gearshift mechanism and a casing Inoperation, the braking mechanism is o a t i n y brake member surroundingnormally in the position illustrated in Fig. 4 said shaft andsecured tosaid casing, an ad- 'when the drivin shaft 2 is propelling 3 v justablebralre member movably mounted on hicle forwardly b rotation in thedirection i stationary mp i i g ea s coindicated by the arrow, 21.

Rotation of the acting between said shaft and said stationary shaft inthis direction carries the gripping brake memberto secure said shaftagainst rollers 11 to the large ends of the recesses 8 rotation in onedirection, and means on said in the fixed ring 1 where there issuiiicient adjustable brake member operable by said space between theperiphery of the collar 9 gear shift mechanism-for rendering the brakandthe outer wall of the recess to it fr e ing device inoperative when thetransmission rolhng of the gripping rollers. When the mechanism isshifted into reverse gear.

shaft 2 rotates in the. reverse direction indi- 3. In an automobilebraking device of the cated by the arrow '22 in Fig. 3 the grippingclass described, the combination with earrollers 11 are'driven into therestricted ends transmission mechanism comprising a rivof the recesses 8where they wedge between i g h ft, gear shift mechanism and a casing,the periphery of the collar 9 and the inclined O a r m mounted on saidcasing comprising surfaces 10 of the fixed rin 'h, Thi ti angularly saced inclined brake surfaces, an

positively secures the drive shaft and the vefidfllstable r ke m6InbcImovably mounted hicle Wheels with which it is connected on s drum, meanson said adjustable memagainst reverse rotation. berfor coacting betweensaid shaft and said The brake m ch ni m may b d d i inclined brakesurfaces for securing said I operative by adjusting the set screw 18 toshaft against rotation in one direction, and

bear upon the lever 17 and hold the toggle 13 means on'said adjustablebrake member operin'a substantially straight position. This ac a by aidgear shift mechanism for rendertion rocks the adjusting rings 5 relativeto the ing saidbraking device inoperative when the fixed ring 1 andretains the gripping rollers transmission mechanism is shifted into re-11 in the enlarged ends of-tlie recesses8. verse gear. a

The brake mechanism is automatically ren- 4. In an automobile brakingdevice of the dered inoperative by the shift rod 15 when -classdescribed, the combination with gear the gear shift lever is moved toits reverse po transmission mechanism comprising a drivsition. Thegroove 19 of the shift rod is of ingxsh'aft, gear shiftmechanism andacasing,

of a drum mounted on said casing comprising ing said braking meansinoperative when said angularly 's aced inclined brake surfaces, anshift rod s moved to a reverse speed pos1t1on. Signed at Chicago this11th day of July,

adjustable rake member movably mounted on said drum, means on saidadjustable member for coacting between said shaft and said inclinedbrake surfaces for securing said shaft against rotation in onedirection, manually operable means for rendering said braking .deviceinoperaive, and means on said adj ustable brake member operable b saidgear shift mechanism for renderingsai braking device inoperative whenthe transmission mechanism is shifted into reverse gear. 5. In anautomobile braking device of the 15 class described, the combinationwith gear.

transmission mechanism comprising a driving shaft, gear shift mechanismand a casing, of a drum mounted on said casing comprising angularlyspaced inclined brake surfaces, an

adjustable brake member movably mounted on said drum, means on saidadjustable member for coacting between said shaft and said inclinedbrake surfaces for securing'said shaft against rotation in onedirection, a toggle 85 mounted in said casing and pivotally connected tosaid adjustable brake member, and

- a lever pivotally mounted on said casing and acting on said toggle,said lever bein operable by said gear shifting mechanism or ren-,.

dering-said braking means inoperative when said transmission mechanismis shifted to reverse gear. 6. In an automobile braking device of theclass described, the combination with gear transmission mechanismcomprising a driving shaft, gear shift-mechanism and a casing,

of a drum mounted on said casing comprising an larly spaced'inclinedbrake surfaces, an ad ustable brake member movably mounted 40 on saiddrum, means on said adjustable member for coacting between said shaftand said inclined brake surfaces for securingsaid shaft against rotationin one direction, a toggle mounted on said casing and pivotallyconnected to said adjustable brake member, a lever pivotally mounted onsaidcasing and acting on said toggle, said lever being operable by saidgear shifting mechanism for rendering said braking means inoperativewhen said transmission mechanism is shifted to reverse gear, and a setscrew in said casing for rendermg said braking means inoperativeindependently of said transmission mechanism. i

7. In an automobile braking means of the class described, thecombination with ar transmission mechanism comprising a s ift rod, adrive shaft, a collar and a transmission casing, of a stationary brakedrum surrounding said collar having angularly spaced inclined brakesurfaces, an adjustable brake member movabl mounted on said drumcompr1s1ng means or wed 'ng betweensaid inclined surfaces and saicollarto secure said 7 shaft against rotation in. one direction, and

means operable by said shift rod for render-.

